I recently had a Changhong LCD TV model LT40876FHD (LS20/LS20A) that was acting up for about a month. After trying everything, the technician at the shop finally fixed it, and I really appreciate their help. The issue was a strange display problem. At first, I thought the logic board was faulty. I ordered a replacement online, but it didn't solve the problem. Replacing the motherboard was too expensive, so I decided to look for other options. Later, I discovered the problem might be with the screen itself, but I wasn't sure what exactly was wrong. I found a troubleshooting guide online and tried following the steps. It was a bit tricky, but eventually, I managed to get it working again. The model numbers I came across include LS20900, SL20A, LT32900, TT37900FHD, LT32876, LT40876FHD, LT42700 (L06), LT47700 (L06), LT32866R, LT37866R, ITV42866L03, ITV42866L03, ITV4786603, ITV42820F, ITV46820F. If you're experiencing similar issues, here's a trick: while the TV is on, turn the volume down to zero, press and hold the mute button for about 3 seconds, then press the local menu button to enter factory mode. To exit, select "FACTORYOUT" from the 14 available options. Here are some images that might help you understand the process better: Alumina Ceramic,Alumina Ceramic Ring,99 Alumina Ceramic Ring,Corrosion Resistance Of Alumina Ceramic Ring Yixing Guanming Special Ceramic Technology Co., Ltd , https://www.guanmingceramic.com